A 17-year-old teen was arrested at his high school last week after a probation search revealed contraband in his backpack, according to authorities.

The student, who was not identified because he is a minor, was booked Feb. 18 into juvenile hall on suspicion of possession of ammunition by a minor, illegal possession of a knife and possession of narcotic paraphernalia, said Julie Wherry, assistant probation division chief for the Sacramento County Probation Department.

The arrest occurred after an employee at Gerber Jr./Sr. High School alerted a probation officer on campus that a student was carrying a backpack that looked suspicious, Wherry said.

The officer learned that the student was on probation, and searched the backpack. The search revealed a three-inch folding knife, handgun ammunition, a hypodermic needle, a pipe and a “minimal” amount of marijuana, Wherry said. Also in the backpack was the disassembled barrel of a handgun, she said, though no charges appeared to stem from that finding.

The student’s parents were notified, and he was taken to juvenile hall. Wherry said probation officers are providing services for the student to help him upon his release from custody.